Fig.017a shows mounting arrangement for both the transmitter and receiver units on the gate pillars. To achieve a high directivity of the IR beam towards the sensor, use a reflector behind the IR LED.
After both the units have been built, connect 6V power supply to the transmitter and the receiver circuits.
The transmitter and receiver units are aligned such that the IR beam falls directly on the IR sensor. As long as IR beam falls on the sensor, its output remains low.
When anyone interrupts the IR beam falling on the sensor, its output goes high to drive transistor into conduction and pin 2 of NE555 goes low momentarily. As a result, NE555 gets triggered and its pin 3 goes high to drive the relay circuit. Output pin 3 of NE555 remains high for around 30 seconds.
After both the units have been built, connect 6V power supply to the transmitter and the receiver circuits.
The transmitter and receiver units are aligned such that the IR beam falls directly on the IR sensor. As long as IR beam falls on the sensor, its output remains low.
When anyone interrupts the IR beam falling on the sensor, its output goes high to drive transistor into conduction and pin 2 of NE555 goes low momentarily. As a result, NE555 gets triggered and its pin 3 goes high to drive the relay circuit. Output pin 3 of NE555 remains high for around 30 seconds.
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